一、步骤
1、获取用户标识openid等步骤请查询我博客——微信小程序支付（JAVA）;
2、申请退款
3、退款回调
二、代码展示
1、小程序代码：
//退款
refund: function (openId) {
var that = this;
wx.request({
url: 'http://t7hhri.natappfree.cc/wechat/refund',
header: {
'content-type': 'application/x-www-form-urlencoded'
},
method: 'POST',
data: {
'openid': openId,
'orderId': '036b2f8a56904804b3eb1da907735bc1',
'deposit': '1'
},
success: function (res) {
console.log('refund:' + JSON.stringify(res.data));
}
})
}
2、后台代码
@RequestMapping(value = "/refund") @ResponseBody public Object refund(HttpServletRequest request) throws Exception { JsonResult jsonResult = new JsonResult(); String code = MessageUtil.CODE_SUCCESS;//状态码 String msg = MessageUtil.MSG_00;//提示信息 PageData pd = new PageData(); try { pd = this.getPageData(); if (!pd.containsKey("orderId") || StringUtils.isEmpty(pd.getString("orderId"))){ code = MessageUtil.CODE_ERROR; msg = MessageUtil.MSG_NULL; }else {// int isCanCancel = diveService.cancelOrder(pd); int isCanCancel = 1; if(isCanCancel == 1){ String nonce_str = getRandomStringByLength(32); String orderId = pd.getString("orderId"); PageData data = new PageData(); data.put("appid", Configure.getAppID()); data.put("mch_id", Configure.getMch_id()); data.put("nonce_str", nonce_str); data.put("sign_type","MD5"); data.put("out_trade_no", orderId);//商户订单号 data.put("out_refund_no", UuidUtil.get32UUID());//商户订单号 data.put("total_fee", "1");//支付金额，这边需要转成字符串类型，否则后面的签名会失败 data.put("refund_fee", "1"); data.put("notify_url", Configure.getNotify_url_refund());//退改成功后的回调地址 String prestr = PayUtil.createLinkString(data); // 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串 //MD5运算生成签名，这里是第一次签名，用于调用统一下单接口 String mysign = PayUtil.sign(prestr, Configure.getKey(), "utf-8").toUpperCase(); data.put("sign", mysign); String result = CertHttpUtil.postData(Configure.getRefundPath(),PayUtil.GetMapToXML(data)); System.out.println(result); Map rep = PayUtil.doXMLParse(result); System.out.println(rep); } } jsonResult.setCode(code); jsonResult.setMessage(msg); }catch (Exception e) { jsonResult.setCode(MessageUtil.CODE_ERROR); jsonResult.setMessage(MessageUtil.MSG_01); logger.error(e.toString(), e); } return jsonResult; }
package com.fh.wx;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.security.KeyStore;import javax.net.ssl.SSLContext;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.config.RequestConfig;import org.apache.http.client.methods.HttpPost;import org.apache.http.conn.ssl.SSLConnectionSocketFactory;import org.apache.http.conn.ssl.SSLContexts;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;/** * Created by 菜园子 on 2018/7/4. */public class CertHttpUtil { private static int socketTimeout = 10000;// 连接超时时间，默认10秒 private static int connectTimeout = 30000;// 传输超时时间，默认30秒 private static RequestConfig requestConfig;// 请求器的配置 private static CloseableHttpClient httpClient;// HTTP请求器 /** * 通过Https往API post xml数据 * @param url API地址 * @param xmlObj 要提交的XML数据对象 * @return */ public static String postData(String url, String xmlObj) { // 加载证书 try { initCert(); } catch (Exception e) { e.printStackTrace(); } String result = null; HttpPost httpPost = new HttpPost(url); // 得指明使用UTF-8编码，否则到API服务器XML的中文不能被成功识别 StringEntity postEntity = new StringEntity(xmlObj, "UTF-8"); httpPost.addHeader("Content-Type", "text/xml"); httpPost.setEntity(postEntity); // 根据默认超时限制初始化requestConfig requestConfig = RequestConfig.custom() .setSocketTimeout(socketTimeout) .setConnectTimeout(connectTimeout) .build(); // 设置请求器的配置 httpPost.setConfig(requestConfig); try { HttpResponse response = null; try { response = httpClient.execute(httpPost); } catch (IOException e) { e.printStackTrace(); } HttpEntity entity = response.getEntity(); try { result = EntityUtils.toString(entity, "UTF-8"); } catch (IOException e) { e.printStackTrace(); } } finally { httpPost.abort(); } return result; } /** * 加载证书 * */ private static void initCert() throws Exception { // 证书密码，默认为商户ID String key = Configure.getMch_id(); // 证书的路径 String path = Configure.getCertPath(); // 指定读取证书格式为PKCS12 KeyStore keyStore = KeyStore.getInstance("PKCS12"); // 读取本机存放的PKCS12证书文件 FileInputStream instream = new FileInputStream(new File(path)); try { // 指定PKCS12的密码(商户ID) keyStore.load(instream, key.toCharArray()); } finally { instream.close(); } SSLContext sslcontext = SSLContexts .custom() .loadKeyMaterial(keyStore, key.toCharArray()) .build(); // 指定TLS版本 SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory( sslcontext, new String[] { "TLSv1" }, null, SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER); // 设置httpclient的SSLSocketFactory httpClient = HttpClients .custom() .setSSLSocketFactory(sslsf) .build(); }}
3、退款回调
/*退款回调*/@RequestMapping(value = "/refundResult")@ResponseBodypublic void refundResult(HttpServletRequest request, HttpServletResponse response) throws Exception { String reqParams = StreamUtil.read(request.getInputStream()); Map result = PayUtil.doXMLParse(reqParams); String return_code = (String) result.get("return_code");//返回状态码 if (return_code.equals("SUCCESS")) { } StringBuffer sb = new StringBuffer("xmlreturn_code![CDATA[SUCCESS]]/return_codereturn_msg![CDATA[OK]]/return_msg/xml"); response.getWriter().write(sb.toString());}
注意：找不到的工具类请找我的上一篇博——微信小程序支付（JAVA）
